This optional hoistable ball bearing halyard swivel can be installed on your headstay so you can raise or lower the sail without removing the headstay. Swivels are independent of the headstay, allowing you to tension the luff separately from the mast rake. The 4mm swivel is for use with: - Harken Underdeck Furling Sytem model 477 - Harken Standard Furling System model 435
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Specifications
| Pin Ø (mm) | 4 |
| Wire Ø Max (mm) | 4 |
| SWL (kg) | 367 |
| NBL (kg) | 734 |
| A (mm) | 124 |
| Weight (g) | 82 |
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